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Magnetoplumbite permanent magnetic ferrite and method of producing the same

A technology of permanent magnet ferrite and magnetoplumbite, which is applied in the direction of inductance/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., can solve the problem of not being able to obtain high magnetic properties and intrinsic coercive force at the same time, and achieve stability sexual effect

Inactive Publication Date: 2009-10-07
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the prior art cannot simultaneously obtain high magnetic properties and high intrinsic coercive force, the present invention provides a sintered permanent ferrite material and a magnet that simultaneously obtain remanence above 4500Gs and intrinsic coercive force exceeding 5000Oe Powder and method for its preparation

Method used

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  • Magnetoplumbite permanent magnetic ferrite and method of producing the same
  • Magnetoplumbite permanent magnetic ferrite and method of producing the same
  • Magnetoplumbite permanent magnetic ferrite and method of producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The batching process selects various raw material requirements and corresponding weight percentages as follows:

[0040] (1) Iron red: the purity of Fe 2 o 3 Content≥99.5wt%, Cl - The original average particle size of particles with ion content ≤ 0.1wt% is 1.6μm, and the weight percentage is 83.4%;

[0041] (2) Strontium carbonate: where the purity of SrCO 3 ≥98.0wt%, the original average particle size of the particles is 2.1μm, and the weight percentage is 4.31%;

[0042] (3) Calcium carbonate: the purity of which is CaCO 3 ≥99.0wt%, the original average particle size of the particles is 4.2μm, and the weight percentage is 2.42%;

[0043] (4) Lanthanum oxide: where the purity La 2 o 3 ≥99.0wt%, the original average particle size of the particles is 4.5μm, and the weight percentage is 7.08%;

[0044] (5) Cobalt trioxide: the purity of Co 2 o 3 ≥99.0wt%, the original average particle size of the particles is 2.5μm, and the weight percentage is 2.78%.

[0045] ...

Embodiment 2

[0062] Raw material selection is the same as embodiment 1, and the various raw materials that constitute these main components are weighed so that the main components after firing are as follows:

[0063] Composition formula: Sr 1-x-y Ca x La y Fe 2n-z co z o 19 , where x=0.2, y=0.4, z=0.3, n=5.0, 5.3, 5.6, 5.8. The above four groups of tests are respectively numbered as Examples 2-1, 2-2, 2-3, and 2-4.

[0064] The raw materials weighed according to the above composition were mixed and ball milled in a wet ball mill for 5 hours, and the average particle size after mixing was about 0.8 μm, then dried in an oven, and then pelletized, pre-fired in the air at 1250 ° C, and kept for 1 hour , to obtain granular calcined material.

[0065] Then, take by weighing 450 grams of four kinds of coarse pulverization calcined materials produced in the above-mentioned way respectively, add 0.6wt% SiO 2 , 0.8wt% CaCO 3 , 0.3wt% Cr 2 o 3 , add 1.0wt% calcium gluconate as a dispersan...

Embodiment 3

[0073] Except that the Sr part in the main component is replaced by Ba, all the other additives are the same as in Example 1. Where Ba is added in the form of barium carbonate, BaCO in the raw material barium carbonate 3 ≥98.0wt%, the original average particle size of the particles is 3.1 μm. After taking the same pre-fired material preparation process as the embodiment, it detects that its main phase can be expressed as: Sr 0.19 Ba 0.16 Ca 0.23 La 0.43 Fe 10.89 co 0.35 o 19 . Then take the substantially same coarse pulverization process as in Example 1, the secondary wet fine pulverization process, after the magnetic field forming process and the corresponding sintering process, measure its sample magnetic properties as shown in table 4:

[0074] Table 4 The main component is Sr 0.19 Ba 0.16 Ca 0.23La 0.43 Fe 10.89 co 0.35 o 19 Sample magnetic properties

[0075]

[0076] The above test results show that the use of part of Ba instead of Sr can promote the r...

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Abstract

The present invention relates to a magnet powder formula of hexagonal type magnetoplumbite permanent magnetic ferrite, sintered magnet and method of producing the same. The invention provides a sintered permanent magnetic ferrite and magnet powder capable of acquiring remanence of more than 4500 Gs and Intrinsic coercivity of more than 5000 Oe at the same time, pointing to problems of unable to acquire high magnetic property and high Intrinsic coercivity at the same time in prior technology, and method of producing the same. major formula of the invention is a permanent magnetic ferrite powder containing hexagonal type magnetoplumbite permanent magnetic ferrite of the following formula as main phase: A[1-x-y]Ca[x]R[y]Fe[2n-z]M[z]O[19], A represents Sr or Sr and Ba, R represents at least one of La, Pr, Nd or Bi, and La is needed; M represents at least one of Co, Ni and Zn, and Co is needed; x, y, z represents addition percentage of each main metal elements.

Description

technical field [0001] The invention relates to a ferrite material and a preparation method, in particular to a magnet powder formula of hexagonal magnetoplumbite ferrite, a sintered magnet and a manufacturing method thereof. Background technique [0002] High-performance sintered permanent magnet ferrite magnet is one of the key basic functional materials of permanent magnet DC motors. It has the characteristics of high residual magnetic flux density, high coercive force and high magnetic energy product, and can meet the requirements of strong demagnetization field, low temperature, high altitude, etc. The use requirements of motors in various environments have high sensitivity and stability, and can be widely used in various types of motors with high power, high speed and high torque, such as high-end automotive motors (ABS motors, starter motors, etc.), motorcycle starters Motors, household appliances and electric tool motors and other fields. [0003] The original perma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/10H01F41/02C04B35/26C04B35/622C04B35/64
Inventor 杨武国韦晓阳包大新何时金付晓敏
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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